/*
* Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
* Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com 
 * Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com>
* Copyright (C) 2007 Holger Hans Peter Freyther
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1.  Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer. 
* 2.  Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution. 
* 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
*     its contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission. 
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "config.h"
#include "SimpleFontData.h"

#include "FloatRect.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "GlyphBuffer.h"
#include <cairo.h>
#include <wtf/MathExtras.h>

#include <ft2build.h>
#include FT_FREETYPE_H

namespace WebCore {

void SimpleFontData::platformInit()
{
	cairo_font_extents_t font_extents;
	cairo_text_extents_t text_extents;
	cairo_scaled_font_extents(m_font.m_scaledFont, &font_extents);
	m_ascent = static_cast<int>(font_extents.ascent);
	m_descent = static_cast<int>(font_extents.descent);
	m_lineSpacing = static_cast<int>(font_extents.height);
	cairo_scaled_font_text_extents(m_font.m_scaledFont, "x", &text_extents);
	m_xHeight = text_extents.height;
	cairo_scaled_font_text_extents(m_font.m_scaledFont, " ", &text_extents);
	m_spaceWidth =  static_cast<int>(text_extents.x_advance);
	m_lineGap = m_lineSpacing - m_ascent - m_descent;
}

void SimpleFontData::platformDestroy()
{
	if (!isCustomFont()) {
		if (m_font.m_pattern && ((char*)-1 != m_font.m_pattern))
			free(m_font.m_pattern);
		if (m_font.m_scaledFont) {
			cairo_scaled_font_destroy(m_font.m_scaledFont);
            m_font.m_scaledFont = 0;
        }
	}

	delete m_smallCapsFontData;
}

SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
	if (!m_smallCapsFontData) {
		FontDescription desc = FontDescription(fontDescription);
		desc.setSpecifiedSize(0.70f*fontDescription.computedSize());
		const FontPlatformData* pdata = new FontPlatformData(desc, desc.family().family());
		m_smallCapsFontData = new SimpleFontData(*pdata);
	}
	return m_smallCapsFontData;
}

bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
	FT_Face face = cairo_ft_scaled_font_lock_face(m_font.m_scaledFont);

	if (!face)
		return false;

	for (unsigned i = 0; i < length; i++) {
		if (FT_Get_Char_Index(face, characters[i]) == 0) {
			cairo_ft_scaled_font_unlock_face(m_font.m_scaledFont);
			return false;
		}
	}

	cairo_ft_scaled_font_unlock_face(m_font.m_scaledFont);

	return true;
}

void SimpleFontData::determinePitch()
{
	m_treatAsFixedPitch = m_font.isFixedPitch();
}

float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
	ASSERT(m_font.m_scaledFont);

	cairo_glyph_t cglyph = { glyph, 0, 0 };
	cairo_text_extents_t extents;
	cairo_scaled_font_glyph_extents(m_font.m_scaledFont, &cglyph, 1, &extents);

	float w = (float)m_spaceWidth;
	if (cairo_scaled_font_status(m_font.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0)
		w = (float)extents.x_advance;
	return w;
}

void SimpleFontData::setFont(cairo_t* cr) const
{
	ASSERT(cr);
	m_font.setFont(cr);
}

}
